Hibernate
/
hibernate-orm
mirror of https://github.com/hibernate/hibernate-orm
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

proof of concept for auto-detection of Oracle MAX_STRING_SIZE

This commit is contained in:
Gavin 2023-04-21 11:56:42 +02:00 committed by Gavin King
parent 3aa47ad423
commit 106dc33a18
1 changed files with 23 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
hibernate-core/src/main/java/org/hibernate/dialect/OracleDialect.java
View File

@ -165,9 +165,12 @@ public class OracleDialect extends Dialect {
: new LegacyOracleLimitHandler( getVersion() );
private final UniqueDelegate uniqueDelegate = new CreateTableUniqueDelegate(this);
/** is it an Autonomous Database Cloud Service? */
// Is it an Autonomous Database Cloud Service?
protected final boolean autonomous;
// Is MAX_STRING_SIZE set to EXTENDED?
protected final boolean extended;
public OracleDialect() {
this( MINIMUM_VERSION );
}
@ -175,11 +178,28 @@ public class OracleDialect extends Dialect {
public OracleDialect(DatabaseVersion version) {
super(version);
autonomous = false;
extended = false;
}
public OracleDialect(DialectResolutionInfo info) {
super(info);
autonomous = isAutonomous( info.getDatabaseMetadata() );
extended = isExtended( info.getDatabaseMetadata() );
}
protected static boolean isExtended(DatabaseMetaData databaseMetaData) {
if ( databaseMetaData != null ) {
try ( java.sql.Statement s = databaseMetaData.getConnection().createStatement() ) {
s.execute( "select cast('string' as varchar2(32000)) from dual" );
// succeeded, so MAX_STRING_SIZE == EXTENDED
return true;
}
catch ( SQLException ex ) {
// failed, so MAX_STRING_SIZE == STANDARD
// Ignore
}
}
return false;
}
protected static boolean isAutonomous(DatabaseMetaData databaseMetaData) {
@ -297,14 +317,13 @@ public class OracleDialect extends Dialect {
@Override
public int getMaxVarcharLength() {
//with MAX_STRING_SIZE=EXTENDED, changes to 32_767
//TODO: provide a way to change this without a custom Dialect
return 4000;
return extended ? 32_767 : 4000;
}
@Override
public int getMaxVarbinaryLength() {
//with MAX_STRING_SIZE=EXTENDED, changes to 32_767
return 2000;
return extended ? 32_767 : 2000;
}
@Override